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authorOliver Neukum <oneukum@suse.com>2016-03-31 12:04:24 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-03-31 09:28:46 -0700
commit4e9a0b05257f29cf4b75f3209243ed71614d062e (patch)
tree610a3a8189a95e2f2c54e1fb1fd6bd7ec3bf96da /drivers/usb
parent59b9023c356c54e5f468029fa504461d04c0f02b (diff)
downloadlinux-4e9a0b05257f29cf4b75f3209243ed71614d062e.tar.bz2
USB: mct_u232: add sanity checking in probe
An attack using the lack of sanity checking in probe is known. This patch checks for the existence of a second port. CVE-2016-3136 Signed-off-by: Oliver Neukum <ONeukum@suse.com> CC: stable@vger.kernel.org [johan: add error message ] Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/mct_u232.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 4446b8d70ac2..885655315de1 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -376,14 +376,21 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port,
static int mct_u232_port_probe(struct usb_serial_port *port)
{
+ struct usb_serial *serial = port->serial;
struct mct_u232_private *priv;
+ /* check first to simplify error handling */
+ if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
+ dev_err(&port->dev, "expected endpoint missing\n");
+ return -ENODEV;
+ }
+
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Use second interrupt-in endpoint for reading. */
- priv->read_urb = port->serial->port[1]->interrupt_in_urb;
+ priv->read_urb = serial->port[1]->interrupt_in_urb;
priv->read_urb->context = port;
spin_lock_init(&priv->lock);